How do you let your boyfriend finger you?

Fingering is when you masturbate for a girl and stick your fingers inside of her or she does it herself. You can not finger breasts.

If he wishes to feel your breasts and you are of legal age for consenting to sexual contact and you are OK with this start making out and kissing.

Some will start out "Over the clothes" and some will get around to directly touching the skin. You will get there eventually and if he is hesitant you have to tell him what you want or ask if he wants to. The key to a good relationship is communication. But PLEASE do not feel pressured into doing anything that is not good for you. Breast stimulation can be very pleasant, but only do it if it is something YOU want to do!